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Sun, 8 Apr 2018 20:20:08 -0400 Received: from mail-bn3nam01on0124.outbound.protection.outlook.com ([104.47.33.124]:14464 "EHLO NAM01-BN3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754083AbeDIATf (ORCPT ); Sun, 8 Apr 2018 20:19:35 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: piaojun , Mark Fasheh , Joel Becker , Junxiao Bi , Joseph Qi , Changwei Ge , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH AUTOSEL for 4.15 117/189] ocfs2/acl: use 'ip_xattr_sem' to protect getting extended attribute Thread-Topic: [PATCH AUTOSEL for 4.15 117/189] ocfs2/acl: use 'ip_xattr_sem' to protect getting extended attribute Thread-Index: AQHTz5hCI0nXsI/5UkWGq+Fj2cviHQ== Date: Mon, 9 Apr 2018 00:18:18 +0000 Message-ID: <20180409001637.162453-117-alexander.levin@microsoft.com> References: <20180409001637.162453-1-alexander.levin@microsoft.com> In-Reply-To: <20180409001637.162453-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0726;7:Ol6MTibpZ5uExzUVrBo08RzIMojZpLvpxVYoCVh0Jd2mo9VClp9brEaT3SnMX2urEcsWhaU9oMH7JlgijRz85i7R0BRQgql6PTsfMuAqs7qTVl6DRVcjgciVMAU4UwIhM8rAdttbdu1RDh1EZIUXI/Y62YHWy40h/vZ2X62q5CZ9MZtKv9gGvS//G4NhlyP3ga2xsgIOLepoWz7cyMk0xIY6JcKbrit6XdEGKg3t/H4hjCipoQZhXHuAXLTtrCt9;20:AGxlE0e08yPSrWpsuRjMhe92kkiEP+5tJlpFNPvuwpSYYwVgsqAB8aScwmxdHlUxAASaqDYRwfqR7PKet55aMvM08yCmW0qrsPQt+VsRb8GVGkj5gaQmNcqIGtRZAKq0V2/aitW1SBJm+DzBZGoxzpV7TNaiUQoBU2QOuH5Yxqw= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: 5513ee63-8b7f-4b85-b053-08d59daf8f0d x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0726; 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x-microsoft-antispam-message-info: xm7FAjYRIWzFhC9+ZrbDiWixQyzCVXdj4abbhpPqB264LhrW42bETkr6enSn0RaN6bVbvn7XNAGMnDZeJiw1RPZFZq3p6dNr7YEUqxVXV+Q3synSvHCn9lF+aFST7cN+R50dSuDqfluAmARy3jRXhUNZ9mxsQ4HUHzke7JO5wg4b+N8ueJ316GniyYdSJJ5qP1j8kU6FM+25JP/JQp7iHb8vzNNYQErCc1P2qGsuGJ6XzTBU1JyxBpS+QL4yedhWVG70qtCii1CkzNYDe3feoYVobmLEzhLfp8ZemKobRUdn5kaXO9ymHTVFf3CJIQTxFLMStLmQBixkqHgL4WxbsaabgXQH7j72So7sOuZjweczeVBxic0un+Y+dVYChjB3W4G9LrxIYueZ3qeJR368HgGHv71n2WIpomO2Y2EBEGk= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5513ee63-8b7f-4b85-b053-08d59daf8f0d X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:18:18.7713 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0726 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: piaojun [ Upstream commit 16c8d569f5704a84164f30ff01b29879f3438065 ] The race between *set_acl and *get_acl will cause getting incomplete xattr data as below: processA processB ocfs2_set_acl ocfs2_xattr_set __ocfs2_xattr_set_handle ocfs2_get_acl_nolock ocfs2_xattr_get_nolock: processB may get incomplete xattr data if processA hasn't set_acl done. So we should use 'ip_xattr_sem' to protect getting extended attribute in ocfs2_get_acl_nolock(), as other processes could be changing it concurrently. Link: http://lkml.kernel.org/r/5A5DDCFF.7030001@huawei.com Signed-off-by: Jun Piao Reviewed-by: Alex Chen Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Cc: Joseph Qi Cc: Changwei Ge Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/ocfs2/acl.c | 6 ++++++ fs/ocfs2/xattr.c | 2 ++ 2 files changed, 8 insertions(+) diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c index 40b5cc97f7b0..917fadca8a7b 100644 --- a/fs/ocfs2/acl.c +++ b/fs/ocfs2/acl.c @@ -311,7 +311,9 @@ struct posix_acl *ocfs2_iop_get_acl(struct inode *inode= , int type) if (had_lock < 0) return ERR_PTR(had_lock); =20 + down_read(&OCFS2_I(inode)->ip_xattr_sem); acl =3D ocfs2_get_acl_nolock(inode, type, di_bh); + up_read(&OCFS2_I(inode)->ip_xattr_sem); =20 ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock); brelse(di_bh); @@ -330,7 +332,9 @@ int ocfs2_acl_chmod(struct inode *inode, struct buffer_= head *bh) if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) return 0; =20 + down_read(&OCFS2_I(inode)->ip_xattr_sem); acl =3D ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh); + up_read(&OCFS2_I(inode)->ip_xattr_sem); if (IS_ERR(acl) || !acl) return PTR_ERR(acl); ret =3D __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); @@ -361,8 +365,10 @@ int ocfs2_init_acl(handle_t *handle, =20 if (!S_ISLNK(inode->i_mode)) { if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { + down_read(&OCFS2_I(dir)->ip_xattr_sem); acl =3D ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, dir_bh); + up_read(&OCFS2_I(dir)->ip_xattr_sem); if (IS_ERR(acl)) return PTR_ERR(acl); } diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c index c5898c59d411..e358f60f25f4 100644 --- a/fs/ocfs2/xattr.c +++ b/fs/ocfs2/xattr.c @@ -638,9 +638,11 @@ int ocfs2_calc_xattr_init(struct inode *dir, si->value_len); =20 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { + down_read(&OCFS2_I(dir)->ip_xattr_sem); acl_len =3D ocfs2_xattr_get_nolock(dir, dir_bh, OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT, "", NULL, 0); + up_read(&OCFS2_I(dir)->ip_xattr_sem); if (acl_len > 0) { a_size =3D ocfs2_xattr_entry_real_size(0, acl_len); if (S_ISDIR(mode)) --=20 2.15.1